Geometry

In a quadrilateral ABCD,
AB is parallel to DC and AD is parallel to BC. Find the perimeter of ΔCOD if the diagonals of the quadrilateral intersect each other at pointOand AC = 20 in, BD = 20 in, AB = 13 in

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  1. The diagonals bisect each other.
    Therefore, DO = 0C = 20/2 = 10 in.
    CD = AB = 13 in.

    P = DO + OC + CD = 10 + 10 + 13 = 33 in.

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